Control device



July 20, 1926. 1593,379

J. BAYER CONTROL DEVICE Filed April 9, 1925 Inventor- Johann 'Baser His Attornel Patented July 2%, 1.926.

UNETE STATES PATENT OFFICE.

aormivu BAYER, or rrarrsrarrnn, AUSTRIA, nssreuon TO GENERAL ELno'rRrc COMPANY, A oorerona'rron on NEW YORK.

CONTROL DEVICE.

Application filed April 9, 1925, Serial No. 2 1,888, and in Austria May 6, 1924.

My invention relates to devices for controlling the interconnection of electric sources or systems, and has for its object the provision of an improved control device which is operable automatically to produce interconnection of a plurality of sources or systems when a predetermined relation has been established between their'electrical conditions.

It is well known that two alternating current systems can be interconnected without disturbance only when they are in phase and operating at substantially the same voltage and frequency or, in other words, when a predetermined relation exists between their electrical conditions. In the past, various devices have been proposed for permitting or causing interconnection of two systems when such a relation has been established, but difficulties have been en.- countered in the operation of these devices due to the fact that they are complicated in structure and involve the use of a number of relay elements or other parts which do not always cooperate in a manner to insure interconnection of the systems at the proper instant. i

In accordance with my invention, these difficulties are largely avoided by the provision of a control devicewhereby interconnection of the systems is controlled through a group of cooperating contacts operated in accordance with the relation existing between the electrical conditions of the systems to be interconnected.

My invention will be better understood from the following description when considered in connection with the accompanying drawing and its scope will be pointed out in the appended claims.

Referring to the drawing, the single figure thereof shows a control device wherein my invention has been embodied.

The figure shows a control device 1 which is arranged to cause an alternating current source 2 to be interconnected with a polyphase line 3 through, a switch 4 when the proper relation exists between the electrical conditions of this line and source. A source of control. current, indicated by lines 5, is provided for energizing the operating coil 6 of the switch 4. The switch 4 is biased to its open position by a spring 7, and 1S ranged to be locked in its closed position by a catch 8,

its rotation in the opposite direction.

The control device 1 comprises a phase and frequency relay including inducing and induced members 9 and 10 respectively and a voltage relay including coils 11 and 12 which are arranged to cooperate with cores supported at opposite ends of a lever 13 pivoted at 14 and mechanically fixed to a member 15.

A counterweight 16 is arranged to be adjusted along the lower portion of the member for biasing the lever 13 more or less strongly to a horizontal position. The upper end of the member 15 is connected through a link 17 to a movable member 18 which controls the position of a resilient contact member 19. It will be observed that the coil 11 is connected to the line 3 through conductors 20 and 21, transformer 22 and conductors 23 and 24, and that the coil 12 is connected to the source 2 through conductors 24, 23, 25, and 26, transformer 27 and conductors 28 and 29. With these connections,

the voltage of line 3 is applied to the coil 11; the voltage of source 2 is applied to coil 12 5 the position of the lever 13 is determined by the relation between the voltages, and the member 18 is maintained at the upper limit of its travel only when the voltages of line 3 and source 2 are substantially equal.

Contact member 30 is arranged to engage the lever 13 when it has reached the limit of its rotation in one direction and a like contact member 31 is arranged to engage this lever when it has reached the limit of In either extreme position of the lever 13, the operating coil 36 of the switch 37 is connected to the line 5 through conductors 33 and 34, lever 13 and conductors 38, 39 and 40; the switch 37 is maintained in open position; the circuit of the switch operating coil 6 is interrupted; and closure of the switch 4 is prevented when asubstantial inequality exists between the voltages applied to coils 11 and 12. g

The inducing member 9 of the frequency and phase relay is arranged to rotate about the same shaft 49 as the induced member 10 of this relay, is biased to a definite position by an adjustable counterweight 50, and is provided with angularly displaced coils 51 and 52, the coil 51 bein connected to the source Q-in parallel wit. the voltage coil 12 and the coil 52 bein connected to the line 3 in parallel with't e' voltage coil 11,

A movable contact member provided with contact surfaces 58 and 54 and biased to its illustrated position by a spring 55 is mounted on the inducing member 9. The induced member 10 of the frequency and phase relay is provided with contact members 56 and 57 which are arranged to engage the contact 53. The member 10 may also be provided with an induced or secondary coil 58 when the torque produced by eddy currents set up in the member 10 by the flux of coils 51 ant is insutficient to operate the relay.

It will be readily understood that the voltages applied to the coils51 and 52 will reach their maximum values at ditterent instants of time so long as a substantial ditterence exists between the phases and froouencies 0t thesexvoltages; that an inducing P flux rotating in space will be produced due to these differences in phase and frequency; that this rotating. flux will cause a torque to be e:-:erted.between the members 9 and 10 which are arranged to rotate indepcnth ently of one another; that the magnitude of this torque will decrease as the phase and frequency differences approach zero; that the resultant-inagneticiicld of" coils 51 and 52 will become stationary-in space when the voltages applied to these coilshavc the same phase and frequency; and. that the induced membernlO will eventually assume a position. in space which will lee-determined by r the directionv of the: stationary magnetic field. produced through. the coils 51 and The torque exerted between. the memliicrs 9 and 10 will thus. decrease to a value at which the pull otgravity on the counterweight50 is sufficient to move the contact 54: into engagement with the contact ll). So long as the-voltages applied to the coils 51 and 52 differ in phase, however, the induced member '10 will continue to rotate, this rotation being. dampened somewhat by the retarding action of stationary 1n. gnet 59 ona metallic dish 60 which is mechanically fined to the member 10. As soon. a the voltagesof coils 51 and 52 come into phase the resultant ma 'netio. field 3130(l uced A 7 Z:

through thesecoils will be in a vertical direction and the induced-member 10 will be locked in a position to bring either the conor contact 57-into engagement with the contact When this occurs, the con tact ib-is forced downwardly to the extreme limit of its travel and, it the contactmenn her 19 is at the upper limit of its travel, the operatingcoil v6 is connected to the line 5 through conductors il and 4i-2,switch 3T, conductors l-f'l and lat, contacts 19 and 45, conductors l6 and 4:7, switch 48 and con ductorl-O, in it! manner to-opera-te the switcl l and interconnect the source 2. with the line 3. It should be noted that .energization of the coil 6 and closure of the switch 1 is thus effected only when the source 2 and line 3 are in phase and operating at the same frequency and voltage, this relation between the electrical conditions of the source and line being indicated by closure of the circuit of coil 6 t-l'irough simultaneous engagement of contact 53 with either contact 56 or 57, of contact ith contact 15 and oi? member 18 with contact 19.

As previously explained, energization oi the switch operating coil is prevented by opening of the switch 37 when the lever is in engagementwith either contact 30 or 31. t will be observed that the conductor is connected through a conductor (51 to a pair of contact members 62 and which are mounted on the inducing member 9 ot the phase and frequency relay and are arranged to coopcratewith contacts (it and 65 respectively which are mounted on a stationary member (36 and connected to the conductor through a conductor 67. lVith these connections, energization of the switch operating coil 6 is prevented not only when the lever 18 is in engagement with contact 30 or 31, but also when contact is in engagement with contact 64; or when contact 63 in engagement with contact 65. Deenergization of the switch operatingcoil 6 is thus positively produced independently of the contacts 19 and l5 when the source Ea and line 3 are not in phase or are not operating at the same voltage and frequency. This of advantage in that closure 01" the starting switch l8 is ineffective to produce operation of the switch 4: when a very substantial dill'erence in voltage, phase and frequency exists between sourceQ and line 3 even though the,contacts 19 and have become :Fused together.

The embodiment ottho invention illustratcd and described herein has been selected tor the purpose of clearly setting forth the principles involved. It willbe up parent, however, that the invention is susceptible of being modified to meet the di:t t'erent conditions encountered in its use and 1 therefore aim to cover by the appended claims all modifications within the true s t and scope ofmy invention.

,'hat. I claim as new and desire to secure by Letters Patent of the United States is:

1. The con'ibination ot a voltage relay comprising acontact control member, a phase and frequency relay comprising a contact control member, and a pair of contacts arranged to be moved into engage meat with one another by said contact control members only when the voltages applied to said relays have substantially the same magnitude, phase and frequency.

The combination of avol agc relay comprising a plurality of operating coils and a movable member, a phase and frequency relay comprising a plurality of operati'ng coils and a movable member, and a pair of contacts arranged to be moved into engagement with one another by said movable members only when the voltages applied to the coils of said voltage relay are substantially equal and the phase and frequency of the voltages applied to the coils of said phase and frequency relay are substantially the same.

3. The combination of a circuit to be controlled, a pair of contact'members connected in said circuit, voltage and phase and frequency relays comprising a plurality of operating coils and contact control members arranged to move said contact members into engagement with one another only when the voltages applied to the operating coils of said relays are of substantially the .same magnitude, phase and frequency, and means for interrupting the said circuit independently of said contact members when said voltages substantially differ in magnitude, phase and frequency. I

a. The combination of a circuit to be controlled, a pair of contact members connected in said circuit, voltage and phase frequency relays comprising a plurality of operating coils and arranged to cooperate in moving said contact members into engagement with one another only when the voltages applied to the operating coils of said relays are of substantially the same magnitude, phase and frequency, and means controlled by said voltage relay for interrupting said circuitindependently of said contact members when the voltages applied to the coils of said voltage relay differ substantially in magnitude.

5. The combination of a circuit to be controlled, a pair of contact members connected in said circuit, voltage and phase and frequency relays comprising a plurality of operating coils and arranged to cooperate in moving said contact members into engagement with one another only when the voltages applied to the operating coils of said relays are of substantially the same magnitude, phase and frequency, and means controlled by said phase and frequency relay for interrupting said circuit independently of said contact members when a substantial difference in phase and frequency exists between the voltages applied to the coils of said phase and frequency relay.

6. The combination of a voltage relay comprising operating coils and a movable member arranged to be rotated in accordance with the relation existing between the magnitudes of the voltages applied to said coils, a phase and frequency relay comprising a rotatable induced member and an inducing member rotatable independently of said induced member and provided with coils for producin torque between said inducing and induced members, contact members, and means for moving said contact members into engagement with one another in response to the rotation of said movable, inducing and induced members into a predetermined relationship.

7 The combination of a voltage relay comprising operating coils and a contact control member, a phase and frequency relay comprising a rotatable induced member pro vided with a contact control member and an inducing member rotatable independently of said induced member, and contacts arranged to be brought into engagement in response to movement of said contact control members into predetermined positions.

8. The combination of a voltage relay comprising operating coils and a contact control member, .a phase and frequency relay comprising a rotatable induced member provided with a contact control member and an inducing member rotatable inde pendently of said induced member and provided with operating coils, means compris ing a magnet and a metallic disk for retarding the rotation of said induced member, and contacts arranged to be moved into engagement with one another by said contact control members.

9. The combination of a voltage relay comprising operating coils and a movable member arranged to rotate in accordance with the relation between the magnitudes of the voltages applied to said coils, means for biasing said movable member to a predetermined position, a phase and frequency relay comprising a rotatable induced member and an inducing member rotatable independently of said induced member and provided with coils for producing a torque between said induced and inducing members, means for biasing said inducing member to a predetermined position, and contact members arranged to be brought into engagement with one another by rotation of said induced member when said movable and inducing members are in said predetermined positions.

10. The combination of a phase and frequency relay comprising a rotatable induced member and an inducing member rotatable independently of said induced member and provided with coils for producing a torque between said inducing and induced members, means for biasing said inducing member to a predetermined position, and a contact member arranged to be operated by rotation of said induced member when said inducing member is in said predetermined position.

In witness whereof, I have hereunto set my hand this 27th day of March, 1925.

JOHANN BAYER. 

